@article{Łenski:2011,
  author  = "W. Łenski and B. Roszak",
  title   = "Lebesgue type points in strong (C, \alfa) approximation of Fourier series",
  journal = "Banach Center Publication",
  volume  = "Vol. 92",
  pages   = "219--235",
  year    = "2011",
  note    = "Institute of Mathematics, Polish Academy of Sciences, Warszawa",
}